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+// Copyright Vladimir Prus 2002-2004.
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+
+#ifndef BOOST_VARIABLES_MAP_VP_2003_05_19
+#define BOOST_VARIABLES_MAP_VP_2003_05_19
+
+#include <boost/program_options/config.hpp>
+
+#include <boost/any.hpp>
+#include <boost/shared_ptr.hpp>
+
+#include <string>
+#include <map>
+#include <set>
+
+namespace boost { namespace program_options {
+
+    template<class charT>
+    class basic_parsed_options;
+
+    class value_semantic;
+    class variables_map;
+
+    // forward declaration
+
+    /** Stores in 'm' all options that are defined in 'options'. 
+        If 'm' already has a non-defaulted value of an option, that value
+        is not changed, even if 'options' specify some value.        
+    */
+    BOOST_PROGRAM_OPTIONS_DECL 
+    void store(const basic_parsed_options<char>& options, variables_map& m,
+                    bool utf8 = false);
+
+    /** Stores in 'm' all options that are defined in 'options'. 
+        If 'm' already has a non-defaulted value of an option, that value
+        is not changed, even if 'options' specify some value.        
+        This is wide character variant.
+    */
+    BOOST_PROGRAM_OPTIONS_DECL 
+    void store(const basic_parsed_options<wchar_t>& options, 
+                    variables_map& m);
+
+
+    /** Runs all 'notify' function for options in 'm'. */
+    BOOST_PROGRAM_OPTIONS_DECL void notify(variables_map& m);
+
+    /** Class holding value of option. Contains details about how the 
+        value is set and allows to conveniently obtain the value.
+    */
+    class BOOST_PROGRAM_OPTIONS_DECL variable_value {
+    public:
+        variable_value() : m_defaulted(false) {}
+        variable_value(const boost::any& v, bool defaulted) 
+        : v(v), m_defaulted(defaulted) 
+        {}
+
+        /** If stored value if of type T, returns that value. Otherwise,
+            throws boost::bad_any_cast exception. */
+       template<class T>
+       const T& as() const {
+           return boost::any_cast<const T&>(v);
+       }
+       /** @overload */
+       template<class T>
+       T& as() {
+           return boost::any_cast<T&>(v);
+       }
+
+        /// Returns true if no value is stored.
+        bool empty() const;
+        /** Returns true if the value was not explicitly
+            given, but has default value. */
+        bool defaulted() const;
+        /** Returns the contained value. */
+        const boost::any& value() const;
+
+        /** Returns the contained value. */
+        boost::any& value();
+    private:
+        boost::any v;
+        bool m_defaulted;
+        // Internal reference to value semantic. We need to run
+        // notifications when *final* values of options are known, and
+        // they are known only after all sources are stored. By that
+        // time options_description for the first source might not
+        // be easily accessible, so we need to store semantic here.
+        shared_ptr<const value_semantic> m_value_semantic;
+
+        friend BOOST_PROGRAM_OPTIONS_DECL
+        void store(const basic_parsed_options<char>& options, 
+              variables_map& m, bool);
+
+        friend BOOST_PROGRAM_OPTIONS_DECL class variables_map;
+    };
+
+    /** Implements string->string mapping with convenient value casting
+        facilities. */
+    class BOOST_PROGRAM_OPTIONS_DECL abstract_variables_map {
+    public:
+        abstract_variables_map();
+        abstract_variables_map(const abstract_variables_map* next);
+
+        virtual ~abstract_variables_map() {}
+
+        /** Obtains the value of variable 'name', from *this and
+            possibly from the chain of variable maps.
+
+            - if there's no value in *this.
+                - if there's next variable map, returns value from it
+                - otherwise, returns empty value
+
+            - if there's defaulted value
+                - if there's next varaible map, which has a non-defauled
+                  value, return that
+                - otherwise, return value from *this
+
+            - if there's a non-defauled value, returns it.
+        */
+        const variable_value& operator[](const std::string& name) const;
+
+        /** Sets next variable map, which will be used to find
+           variables not found in *this. */
+        void next(abstract_variables_map* next);
+
+    private:
+        /** Returns value of variable 'name' stored in *this, or
+            empty value otherwise. */
+        virtual const variable_value& get(const std::string& name) const = 0;
+
+        const abstract_variables_map* m_next;
+    };
+
+    /** Concrete variables map which store variables in real map. 
+        
+        This class is derived from std::map<std::string, variable_value>,
+        so you can use all map operators to examine its content.
+    */
+    class BOOST_PROGRAM_OPTIONS_DECL variables_map : public abstract_variables_map,
+                               public std::map<std::string, variable_value>
+    {
+    public:
+        variables_map();
+        variables_map(const abstract_variables_map* next);
+
+        // Resolve conflict between inherited operators.
+        const variable_value& operator[](const std::string& name) const
+        { return abstract_variables_map::operator[](name); }
+        
+        void notify();
+
+    private:
+        /** Implementation of abstract_variables_map::get
+            which does 'find' in *this. */
+        const variable_value& get(const std::string& name) const;
+
+        /** Names of option with 'final' values -- which should not
+            be changed by subsequence assignments. */
+        std::set<std::string> m_final;
+
+        friend BOOST_PROGRAM_OPTIONS_DECL
+        void store(const basic_parsed_options<char>& options, 
+                          variables_map& xm,
+                          bool utf8);
+        
+        /** Names of required options, filled by parser which has
+            access to options_description. */
+        std::set<std::string> m_required;
+    };
+
+
+    /*
+     * Templates/inlines
+     */
+
+    inline bool
+    variable_value::empty() const
+    {
+        return v.empty();
+    }
+
+    inline bool
+    variable_value::defaulted() const
+    {
+        return m_defaulted;
+    }
+
+    inline
+    const boost::any&
+    variable_value::value() const
+    {
+        return v;
+    }
+
+    inline
+    boost::any&
+    variable_value::value()
+    {
+        return v;
+    }
+
+}}
+
+#endif